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IEEE Transactions on Biomedical Engineering

Issue 5 • Date Sept. 1974

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Displaying Results 1 - 22 of 22
  • Table of contents

    Publication Year: 1974, Page(s): c1
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  • IEEE Engineering in Medicine and Biology Group

    Publication Year: 1974, Page(s): c2
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  • An Algorithm for Locating the Aortic Valve and the Apex in Left-Ventricular Angiocardiograms

    Publication Year: 1974, Page(s):345 - 349
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2290 KB)

    Efforts to automate the estimation of left-ventricular volume from serial angiocardiograms have neglected the explicit location of the aortic valve line and the ventricle apex. From heuristic considerations of typical aorta-ventricle outlines, an algorithm has been developed to find these key points. The algorithm tracks the turning of the aorta-ventricle outline and uses this information to find ... View full abstract»

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  • A Model for Mutual Excitation in a Neuron Population in Olfactory Bulb

    Publication Year: 1974, Page(s):350 - 358
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2411 KB)

    The glomerular neurons are small cells in the olfactory bulb which form numerous synaptic connections with each other and with the output neurons of the bulb, the mitral-tufted cells. They form in the mass two anatomical feedback loops, one within the population, the other between the populations of glomerular and mitral-tufted cells. The poststimulus time (PST) histograms of single glomerular neu... View full abstract»

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  • Stability Characteristics of Positive Feedback in a Neural Population

    Publication Year: 1974, Page(s):358 - 364
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1956 KB)

    Glomerular neurons were driven by single shock stimulation of the primary olfactory nerve (PON). The poststimulus time (PST) histograms showed a rapid increase in pulse probability to a crest, followed by an exponential decay to background level P0. The crest magnitude and decay rate both increased with increasing stimulus intensity. The decay rate was extrapolated to zero at threshold. Thi... View full abstract»

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  • Closed-Loop Positioning of Hemiplegic Patient's Joint by Means of Functional Electrical Stimulation

    Publication Year: 1974, Page(s):365 - 370
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1748 KB)

    We report about the results on positioning of the ankle joint of a hemiplegic patient and of normal experimental subjects, using functional electrical stimulation (FES) of antagonistic muscle groups and position feedback. Such a controller is intended to be used as the execution level of a multilevel orthotic system. The synthesis of the controller has been made with the aid of the components of a... View full abstract»

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  • The active fiber in a volume conductor

    Publication Year: 1974, Page(s):371 - 381
    Cited by:  Papers (81)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2957 KB)

    This paper considers the quantitative description of intracellular and extracellular fields of a single circular cylindrical fiber resulting from the propagation of an action potential (AP). Several formulations are noted, but one, which permits identification of free-space source-sink relationships, is examined in some detail; the physical models which it gives rise to are described and developed... View full abstract»

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  • An Amplitude-Modulation Model for the QRS Complexes of Electrocardiograms

    Publication Year: 1974, Page(s):381 - 386
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1436 KB)

    The fact that all practical QRS loops in vectorcardiograms are not geometrically well defined renders the analytical studies of QRS waveforms in electrocardiograms difficult. However, many important properties of practical loops can be revealed by and understood through the use of idealized loops which can be easily and analytically treated. By means of a uniformly inscribed circular QRS loop, one... View full abstract»

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  • A Discrete-Time Model for Cell-Age, Size, and DNA Distributions of Proliferating Cells, and its Application to the Movement of the Labeled Cohort

    Publication Year: 1974, Page(s):387 - 398
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2505 KB)

    The dynamics of cell cycle and proliferating kinetics are characterized by the state equations, which are linear difference matrix equations with their state vectors consisting of variables representing cells in a particular compartment for cell-age, cell-size, and cell-DNA content. The transformation required from the cell-age distribution to the cell-size and DNA distributions in this discrete-t... View full abstract»

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  • A Stimulation-Recording Technique for Evaluating Binaural Sound Processing in Porpoises

    Publication Year: 1974, Page(s):399 - 405
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3538 KB)

    A semiautomatic system has been developed to evaluate temporal and binaural aspects of the porpoise sonar receiving system at the level of the midbrain. Surgical and electronic techniques are combined to test this fast acting system and permit replication by digital computer. Pulsed-sound projectors were used to binaurally simulate porpoise sonar clicks underwater, in an azimuth about their heads.... View full abstract»

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  • Pulse Pressure Contour Method Testing Via Hybrid Computer Simulation

    Publication Year: 1974, Page(s):406 - 413
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2148 KB)

    A variety of methods have been proposed for determining cardiac output from the shape of the central pulse pressure contour. Each of these methods uses a calibrated constant of proportionality to relate the stroke volume to the specific function of the pulse pressure contour. View full abstract»

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  • Digital Image Processing in Radioisotope Scanning

    Publication Year: 1974, Page(s):414 - 416
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2778 KB)

    The ready availability and high speeds of small digital processors (minicomputers) has made possible fast translation to and from discrete time and frequency domains through the fast Fourier transform (FFT). Formerly time-consuming operations on sequences can now be performed more efficiently and easily in the discrete frequency domain. View full abstract»

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  • An On-Line Analog Electronic Reset Integrator

    Publication Year: 1974, Page(s):416 - 419
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2842 KB)

    Circuit details and operational instructions for a precision electronic reset integrator are presented. The unit is compatible with commercial flow measuring equipment. The maximum output signal is 12 V, and the drift is less than 10 mV/s. A built-in calibrator facilitates the setup of recording instruments, and the design is expandable for up to ten channels. View full abstract»

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  • Comments on "Induction Thermocoagulation - A Seed Power Study"

    Publication Year: 1974, Page(s): 419
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (194 KB)

    In the above communication, Merry, Hale, and Zervas proposed two eddy-current models of seed implant heating. Their theoretical calculations and experimental observations showed the observed heating falls somewhere between the two models discussed. I wish to note some corrections to the theoretical results which will clearly delineate the applicability of the skin effect model and the inadequacies... View full abstract»

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  • Comments on "Catheter Smearing Correction Using Inverse Filtering Techniques

    Publication Year: 1974, Page(s):419 - 421
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (813 KB)

    The above paper is reinterpreted and some of its conclusions thereby called into question. View full abstract»

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  • Thin-Film Temperature Sensors for Biological Measurements

    Publication Year: 1974, Page(s):421 - 423
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1103 KB)

    Dynamic as well as static temperature measurements are now possible in biological tissue using thin-film Cu-Ni microthermocouples. These probes which use a quartz substrate exhibit response times of less than a millisecond with thermal properties similar to tissue. Their thermoelectric EMF of 21 , ¿m V/°C is linearly dependent on temperature over the range normally encountered in biological meas... View full abstract»

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  • Determination of System Function for Some Types of Gamma-Ray Collimators

    Publication Year: 1974, Page(s):423 - 425
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1213 KB)

    A method to compute the system function of gamma-ray multichannel collimators having a point spread which is periodic in the angle when expressed in polar coordinates is described. This is the case when the cross section of the channel distribution is hexagonal, for example. The computation is done in terms of sample of the responses to a finite number of lines. View full abstract»

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  • A Thermesthesiometer - An Instrument for Burn Hazard Measurement

    Publication Year: 1974, Page(s):425 - 427
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Surface temperature measurement alone is insufficient to establish the hazard to the human of contact with a hot or cold object. A metal surface is more likely to cause thermal injury than a plastic surface at the same temperature. An instrument equipped with a measuring probe has been developed for indicating the temperature that would be experienced if human contact were made with the hot surfac... View full abstract»

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  • An Inexpensive Mechanical Stimulator Incorporating A New Optoelectronic Device

    Publication Year: 1974, Page(s):428 - 429
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (337 KB)

    A displacement monitor for use with mechanical stimulators with range of 2.5 mm, ±5-percent linearity, l-¿m resolution, and less than 25-¿s rise time can be built inexpensively using a solid-state interrupter module. Operational amplifier circuits are given for loudspeaker driver and monitor electronics. View full abstract»

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  • Contributors

    Publication Year: 1974, Page(s):430 - 432
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  • IEEE Transactions on Biomedical Engineering Statement of Editorial Policy

    Publication Year: 1974, Page(s): 432-a
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  • Institutional listings

    Publication Year: 1974, Page(s): 432b
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Aims & Scope

IEEE Transactions on Biomedical Engineering contains basic and applied papers dealing with biomedical engineering. Papers range from engineering development in methods and techniques with biomedical applications to experimental and clinical investigations with engineering contributions.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Bin He
University of Minnesota